Countries are scrambling to develop strategies to fight climate change, as a desire to mitigate its effects intensifies around the world.

The U.S. is one of the biggest nations facing climate disparity right now, since the Trump administration chose to pull the country out of the global Paris Agreement last summer. As the federal government's support for climate issues lags, however, U.S. cities have vowed to uphold the charter's principles — and commitment to climate hasn't stopped there.

"This is not an illusion, that cities are running into a wall," said Dylan Siegler, sustainability specialist for NRG Energy. "The energy market landscape has become increasingly complex, so the sophistication that’s required to navigate the proliferation of new technologies [and] the new parity, or near parity, of renewables is genuinely difficult."